Journal
BIOLOGY AND FERTILITY OF SOILS
Volume 50, Issue 4, Pages 593-601Publisher
SPRINGER
DOI: 10.1007/s00374-013-0880-9
Keywords
Poplar; Rhizosphere; Ectomycorrhizae; Helper bacteria; Bacillus sp.
Categories
Funding
- Special Research Program for Forestry Sectors Beneficial to Public, State Forestry Administration, China [201004061]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
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If mycorrhizal formation could be enhanced by co-inoculation with mycorrhiza helper bacteria (MHB) which promote rapid root colonization by specific ectomycorrhizal fungi, this would be of advantage to the poplar forest industry. A number of poplar rhizobacterial strains were isolated from 11 regions of the eastern China. Four of the isolates, SY15, DZ18, HLJ4, and PY10, were characterized as MHB potential strains based on their positive effect on growth of ectomycorrhizal fungi Pisolithus tinctorius (Pers.) and Lactarius insulsus (Fr.). Under greenhouse conditions, one of the bacterial isolate, DZ18, significantly promoted the poplar trees growth and ectomycorrhizal colonization of P. tinctorius and L. insulsus on Populus deltoides Marsh. In contrast, the other three isolates SY15, HLJ4, and PY10 promoted fungal growth in vitro experiments but did not enhance ectomycorrhizal (ECM) formation in the greenhouse experiment. Therefore, it was concluded that DZ18 can be considered as an MHB strain. DZ18 was identified as Bacillus sp. based on morphological, physiological, and biochemical analyses in combination with analysis of 16S rDNA gene sequences.
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